For all figures, observations are on the top panels (A, B, C) and abundance estimates on the bottom panels (D, E, F). The lines represent the aircraft transects, while the dots show the observations of both individual and groups. Each observation plot shows the number of sightings and the total number of individuals detected. The estimated abundance over the whole area, with the 95% confidence intervals, is also shown for the estimation plots. Left panels present visual monitoring, centre panels low-altitude digital monitoring, and right panels high-altitude digital monitoring.

AO51

Bretagne sud - 23/07/2022

Alcids

Gannets

Larids

Cormorants

Divers

Grebes

Skuas

Shearwaters

Fulmars

Storm petrels

Cetaceans

## Fitting half-normal key function
## Key only model: not constraining for monotonicity.
## AIC= 792.57
## No survey area information supplied, only estimating detection function.

Sharks

Large fish

Sunfish

Jellyfish

AO52

Bretagne sud - 22/09/2022

Alcids

Gannets

Larids

Cormorants

Divers

Grebes

Skuas

Shearwaters

Fulmars

Storm petrels

Cetaceans

Sharks

Large fish

Sunfish

## Fitting half-normal key function
## Key only model: not constraining for monotonicity.
## AIC= 340.497
## No survey area information supplied, only estimating detection function.

Jellyfish

AO53

Bretagne sud - 21/01/2023

Alcids

Gannets

Larids

Cormorants

Divers

Grebes

Skuas

Shearwaters

Fulmars

Storm petrels

Cetaceans

Sharks

Large fish

Sunfish

Jellyfish

AO54

Bretagne sud - 27/03/2023

Alcids

Gannets

Larids

Cormorants

Divers

Grebes

Skuas

Shearwaters

Fulmars

Storm petrels

Cetaceans

Sharks

Large fish

Sunfish

Jellyfish